High-performance polyurethane nanocomposites based on UPy-modified cellulose nanocrystals

From nanocellulose to wood particles: A review of particle size vs. the properties of plastic composites reinforced with cellulose-based entities

“…Polyurethanes Tian et al (2019) noted that hydrogen bonding can be expected to play an important role in the interaction between cellulose and polyurethane. They used this concept in explaining their promising results with cellulose nanocrystals as a filler for polyurethane.…”

“…None of the reports involving polyurethane composites compared cellulose-based particles of differing size. However, cited work (Chen et al 2019, Tian et al 2019 suggests that this would be a good candidate for studies with different sizes of cellulose reinforcement. That is because certain polyester resins can be cured with low to moderate temperature, avoiding damage to cellulosic reinforcements.…”

Healable Strain Sensor Based on Tough and Eco-Friendly Biomimetic Supramolecular Waterborne Polyurethane

“…Polyurethane has a unique microphase separation microstructure because of the poor thermodynamic compatibility between the hard segments and soft matrixes, which endows it with a remarkable toughness and elasticity. , On top of that, polyurethane architecture can be easily tailored by diols, isocyanates, and chain extenders, thus enabling the development of a series of derived materials with comprehensive properties. In the past few years, researchers have developed some high-performance and self-healable polyurethanes by introducing dynamic covalent bonds or supramolecular motifs into the molecular backbones, , for example, disulfide bond, , π–π stacking, metal–ligand coordination, , and H-bond. − These reversible chemical bonds allow the as-prepared polyurethanes to be completely or partially repaired after being damaged. , It is particularly worth mentioning that the H-bond is an advisable interaction toward the preparation of self-healing macromolecules, due to the outstanding stability and rapid kinetic reversibility. , Intriguingly, it has been confirmed that abundant H-bond supramolecular interactions extensively exist in numerous biomacromolecules (titin, cellulose, , spider silk, − and so on), which manifest the efficient combination of mechanical robustness and self-healing capability. So far, many efforts have been devoted to mimicking these biopolymers to synthesize polyurethane materials with modulated properties.…”

Turning things around: from cationic/anionic complexation-induced nanoemulsion instability to toughened water-resistant waterborne polyurethanes

“…The first phase originated from the decomposition of the hard chain segments in the network and the second phase was attributed to the decomposition of the soft chain segments, indicating that the WPUs had a good thermal stability. 40 The temperature dependence of the WPU storage modulus ( G ′) and loss modulus ( G ′′) was further examined by using dynamic mechanical analysis (DMA). In Fig.…”